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am335x, guardian: Enable backlight

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Enable backlight, set brightness value and dimming frequency

Signed-off-by: Gireesh Hiremath <Gireesh.Hiremath@in.bosch.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Link: https://lore.kernel.org/r/20210611161350.2141-13-Gireesh.Hiremath@in.bosch.com
This commit is contained in:
Gireesh Hiremath 2021-06-11 16:13:44 +00:00 • committed by Lokesh Vutla
parent d364926da3
commit ae628fb6da
2 changed files with 27 additions and 0 deletions
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26
board/bosch/guardian/board.c
View file

@ -225,12 +225,38 @@ err:
env_set("swi_status", "err");
}
void lcdbacklight_en(void)
{
unsigned long brightness = env_get_ulong("backlight_brightness", 10, 50);
if (brightness > 99 || brightness == 0)
brightness = 99;
/*
* Brightness range:
* WLEDCTRL2 DUTY[6:0]
*
* 000 0000b = 1%
* 000 0001b = 2%
* ...
* 110 0010b = 99%
* 110 0011b = 100%
*
*/
tps65217_reg_write(TPS65217_PROT_LEVEL_NONE, TPS65217_WLEDCTRL2,
brightness, 0xFF);
tps65217_reg_write(TPS65217_PROT_LEVEL_NONE, TPS65217_WLEDCTRL1,
brightness != 0 ? 0x0A : 0x02, 0xFF);
}
int board_late_init(void)
{
#ifdef CONFIG_LED_GPIO
led_default_state();
#endif
set_bootmode_env();
lcdbacklight_en();
return 0;
}
#endif /* CONFIG_BOARD_LATE_INIT */

1
include/configs/am335x_guardian.h
View file

@ -59,6 +59,7 @@
BOOTENV \
GUARDIAN_DEFAULT_PROD_ENV \
"autoload=no\0" \
"backlight_brightness=50\0" \
"bootubivol=rootfs\0" \
"distro_bootcmd=" \
"setenv rootflags \"bulk_read,chk_data_crc\"; " \